Portion of a shoe



FIG. 1 is a top perspective view of a portion of a shoe showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a rear view thereof.

The sides not shown form no part of the claimed design.

The broken lines shown in the drawings represent portions of a shoe that form no part of the claimed design. The dot-dashed lines in the Figures represent the boundary lines of the claimed design. 

The ornamental design for a portion of a sole, as shown and described. 